未知题型 The causal relation encoded in the paragraph in Task 2.2 (Page. 51) is not a cause and effect in the conventional sense, but more of a logical deduction. Read the paragraph. Decide whether the following statements are true or false. 1. Sentence 1 is the topic sentence.

未知题型 风是看不见的，所以无法判断风的大小（）

未知题型 测试XPS粉末样品时，试样可以采用涂敷法或（ ）制备。